Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510..291w&link_type=abstract
The Astrophysical Journal, Volume 510, Issue 1, pp. 291-304.
Astronomy and Astrophysics
Astronomy
25
Ism: Abundances, Ism: Clouds, Ism: Individual: Alphanumeric: B5, Ism: Molecules, Ultraviolet: Ism
Scientific paper
We present GHRS observations of interstellar C I and CO toward three stars located in the direction of the Perseus region near the B5 molecular cloud and discuss these together with published results from a fourth sight line. The column densities of the three fine-structure levels of C I are used together with ground-based optical data and published ultraviolet data to yield several properties of the gas along the stellar sight lines. The selected stars probe gas located in the neutral envelope surrounding the dense molecular cloud. The gas pressure is tightly constrained by our observations, yielding a value of ~2200 K cm^-3 in the vicinity of B5, somewhat higher than in the surrounding interstellar medium. We also present estimates of the kinetic temperature, based on observations of H_2 and C_2, yielding 20-60 K in the vicinity of B5. Together with the pressure determination, this implies a local gas density of 35-100 cm^-3, very close to that which would be implied by the observed H_2 column density assuming a filling factor of unity. This result provides additional support to the notion that the gas is part of an extensive, uniform gaseous halo surrounding the B5 cloud. The combination of temperature and pressure suggests that the diffuse gas may be part of a general outflow from the dense molecular cloud.
Andersson Bengt-Goran
Federman Steven Robert
Penprase Bryan Edward
Wannier Peter
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